| 1 | /***********************************************************************
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| 2 |
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| 3 | A JavaScript tokenizer / parser / beautifier / compressor.
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| 4 | https://github.com/mishoo/UglifyJS2
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| 5 |
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| 6 | -------------------------------- (C) ---------------------------------
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| 7 |
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| 8 | Author: Mihai Bazon
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| 9 | <mihai.bazon@gmail.com>
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| 10 | http://mihai.bazon.net/blog
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| 11 |
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| 12 | Distributed under the BSD license:
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| 13 |
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| 14 | Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com>
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| 15 |
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| 16 | Redistribution and use in source and binary forms, with or without
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| 17 | modification, are permitted provided that the following conditions
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| 18 | are met:
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| 19 |
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| 20 | * Redistributions of source code must retain the above
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| 21 | copyright notice, this list of conditions and the following
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| 22 | disclaimer.
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| 23 |
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| 24 | * Redistributions in binary form must reproduce the above
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| 25 | copyright notice, this list of conditions and the following
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| 26 | disclaimer in the documentation and/or other materials
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| 27 | provided with the distribution.
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| 28 |
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| 29 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY
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| 30 | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 31 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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| 32 | PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE
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| 33 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
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| 34 | OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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| 35 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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| 36 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 37 | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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| 38 | TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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| 39 | THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 40 | SUCH DAMAGE.
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| 41 |
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| 42 | ***********************************************************************/
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| 43 |
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| 44 | // bitfield flags to be stored in node.flags.
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| 45 | // These are set and unset during compression, and store information in the node without requiring multiple fields.
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| 46 | export const UNUSED = 0b00000001;
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| 47 | export const TRUTHY = 0b00000010;
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| 48 | export const FALSY = 0b00000100;
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| 49 | export const UNDEFINED = 0b00001000;
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| 50 | export const INLINED = 0b00010000;
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| 51 | // Nodes to which values are ever written. Used when keep_assign is part of the unused option string.
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| 52 | export const WRITE_ONLY = 0b00100000;
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| 53 |
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| 54 | // information specific to a single compression pass
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| 55 | export const SQUEEZED = 0b0000000100000000;
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| 56 | export const OPTIMIZED = 0b0000001000000000;
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| 57 | export const TOP = 0b0000010000000000;
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| 58 | export const CLEAR_BETWEEN_PASSES = SQUEEZED | OPTIMIZED | TOP;
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| 59 |
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| 60 | export const has_flag = (node, flag) => node.flags & flag;
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| 61 | export const set_flag = (node, flag) => { node.flags |= flag; };
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| 62 | export const clear_flag = (node, flag) => { node.flags &= ~flag; };
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